Waterproofing composition



Patented Sept. 5, 1922.

more STATES OTTO RUFF, 0F BRESLAU, GERMANY.

WATERPROOFING COMPOSITION.

No Drawing) To all whom. it may concern:

Be it known that I, OTTO RUFF, a citizen of the German Republic, residing at Breslau 16. Germany, have invented certain new and useful Improvements in Vaterproofing Composition, of which the following is a specification.

The use of metal soaps ('zinccopperleadaluminum soaps and the like) for waterproofing porous surfaces against the entrance of water or of aqueous solutions is known. The soap has either been painted on, dissolved in benzine, turpentine oil or the like or it has been produced only in the surface. In order to produce metal soaps in the surface, this surface is painted or impregnated either first with the solution of an alkaline soap and then with the solution of a convenient salt of the metal in question or with alkaline solutions which contain-an alkaline soap and the hydroxide of the metal.

The latter process has been described in the German Patents Nos. 285967 and 286768 and it is based upon the observation that aqueous alkaline solutions of metallic hydroxide can be admixed with those of alkaline soaps without the separation of the metal soap from the mixture, this metal soap forming only in the porous surface after the solution has evaporized. Accordingto the German Patents 285967 and 286768 a liquid is used for the painting which consists of soap solutions in addition to an alkaline orammoniacal solution of the hydroxides of the zinc, copper, lead, tin, chromium .or aluminum.

It has been found out that the indirect method used at present for producing an efficacious waterproofing by zinc soap with Application filed November 25, 1921. Serial No. 517,954.

the aid of aqueous solutions is not necessary. A colloidal solution of zinc soap could be produced directly and painted upon the porous surface. In order to obtain the colloidal solution of the zinc soap 1t is merely necessary to add a little ammonia. The'ammonia plays then the part of a peptisating substance. The present invention is based upon this observation and it consists in usmg tor the Waterproofing of porous surfaces, colloidal ammoniacal aqueous solutions of zinc soap.

- For the production of such a solution ordinary soap solutions are first admixed with a. solution of sulphate of zinc inequivalent relation or in excess. The zinc soap is thus produced and separated as precipitated. The soap is heated, after thorough lixiviation with water, together with a solution of a' little ammonia or of salts which split off ammonia, for instance ammonium carbonate, whereby it is transformed into a whitish turbid liquid which is adapted without further treatment for painting or impregnation.

I claim l. A waterproofing composition consisting of a colloidal solution prepared of zinc soap in ammoniacal water.

2. Method for the production of a waterproofing composition consisting in transforming zinc soap into a colloidal solution by heating the same in ammoniacal water.

In testimony-whereof I affix my signature in presence of two witnewes.

OTTO RUFF.

WVitnesses:

Dr. SIEGFRIED LUsBIG, ALFORD BECKER. 

